<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script src="browser.min.js"></script>
<script type="text/babel">
    function f(x,y){
        return {x,y}
    }
    console.log(f(1,2));

    var target = {
        a: 1,
        b: 1
    };
    var source1 = {
        b: 2
    };
    var source2 = {
        b: 3
    };
    console.log(Object.is(1,1));
    //不支持ie9
//    Object.assign(target,source1,source2);
//    console.log(target);
</script>
</body>
</html>